LM2576T-ADJ/NOPB National Semiconductor, LM2576T-ADJ/NOPB Datasheet - Page 6

IC REG SIMPLE SWITCHER TO-220-5

LM2576T-ADJ/NOPB

Manufacturer Part Number
LM2576T-ADJ/NOPB
Description
IC REG SIMPLE SWITCHER TO-220-5
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Type
Step-Down (Buck)r
Datasheets

Specifications of LM2576T-ADJ/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.23 ~ 37 V
Current - Output
3A
Frequency - Switching
52kHz
Voltage - Input
4 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
Current, Input Bias
50 nA
Current, Output
3 A
Current, Supply
5 mA
Frequency, Oscillator
52 kHz
Package Type
TO-220
Regulator Type
Buck (Step-Down)
Resistance, Thermal, Junction To Case
2 °C/W
Temperature, Operating, Range
-40 to +125 °C
Voltage, Input
40 V
Voltage, Output
1.23 to 37 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device
Other names
*LM2576T-ADJ
*LM2576T-ADJ/NOPB
LM2576T-ADJNS
www.national.com
DEVICE PARAMETERS
θ
θ
θ
θ
ON /OFF CONTROL Test Circuit Figure 2
V
V
I
I
IH
IL
Symbol
All Output Voltage Versions
Electrical Characteristics
JA
JA
JC
JA
Specifications with standard type face are for T
Range. Unless otherwise specified, V
= 30V for the 15V version. I
IH
IL
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2576/LM2576HV is used as shown in the Figure 2 test circuit, system performance will be as shown in system parameters section of Electrical Characteristics.
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V versions, to force the
output transistor OFF.
Note 7: V
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
board with minimum copper area.
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with
containing approximately 4 square inches of copper area surrounding the leads.
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using
0.5 square inches of copper area, θ
Note 11: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop
approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle
from 5% down to approximately 2%.
Typical Performance Characteristics
(Circuit of Figure 2)
IN
= 40V (60V for high voltage version).
Thermal Resistance
ON /OFF Pin
Logic Input Level
ON /OFF Pin Input
Current
Normalized Output Voltage
Parameter
JA
LOAD
is 50˚C/W, with 1 square inch of copper area, θ
= 500 mA.
IN
= 12V for the 3.3V, 5V, and Adjustable version, V
T Package, Junction to Ambient (Note 8)
T Package, Junction to Ambient (Note 9)
T Package, Junction to Case
S Package, Junction to Ambient (Note 10)
V
V
ON /OFF Pin = 5V (OFF)
ON /OFF Pin = 0V (ON)
01147627
(Continued)
OUT
OUT
J
= 0V
= Nominal Output Voltage
= 25˚C, and those with boldface type apply over full Operating Temperature
Conditions
6
JA
is 37˚C/W, and with 1.6 or more square inches of copper area, θ
Line Regulation
IN
= 25V for the 12V version, and V
Typ
1.4
1.2
65
45
50
12
2
0
LM2576HV-XX
1
1
LM2576-XX
4
2
inch leads soldered to a PC board
inch leads in a socket, or on a PC
(Note 2)
2.2/2.4
1.0/0.8
Limit
01147628
30
10
JA
is 32˚C/W.
µA(Max)
µA(Max)
(Limits)
V(Max)
V(Min)
Units
˚C/W
µA
µA
IN

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